At Three Corners Of A Rectangle Length 2d Height

At three corners of a rectangle (length = 2d, height = d), the following charges are located: +q1 (upper left corner), +q2 (lower right corner), and -q (lower left corner). The net electric field at the (empty) upper right corner is zero. Find the magnitudes of q1 and q2. Express your answers in terms of q.

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